BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	count(*) as numwait
from
	supplier,
	lineitem l1,
	orders,
	nation
where
	s_suppkey = l1.l_suppkey
	and o_orderkey = l1.l_orderkey
	and o_orderstatus = 'F'
	and l1.l_receiptdate > l1.l_commitdate
	and exists (
		select
			*
		from
			lineitem l2
		where
			l2.l_orderkey = l1.l_orderkey
			and l2.l_suppkey <> l1.l_suppkey
	)
	and not exists (
		select
			*
		from
			lineitem l3
		where
			l3.l_orderkey = l1.l_orderkey
			and l3.l_suppkey <> l1.l_suppkey
			and l3.l_receiptdate > l3.l_commitdate
	)
	and s_nationkey = n_nationkey
	and n_name = 'CANADA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1977861.41..1977861.42 rows=1 width=26) (actual time=39741.846..39741.863 rows=100 loops=1)
   Buffers: shared hit=14104932 read=664536 dirtied=253 written=319
   ->  Sort  (cost=1977861.41..1977861.42 rows=1 width=26) (actual time=39741.844..39741.851 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=14104932 read=664536 dirtied=253 written=319
         ->  HashAggregate  (cost=1977861.39..1977861.40 rows=1 width=26) (actual time=39739.689..39740.741 rows=4054 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=14104924 read=664536 dirtied=253 written=319
               ->  Nested Loop Anti Join  (cost=2443.74..1977861.39 rows=1 width=26) (actual time=21.719..39682.681 rows=40208 loops=1)
                     Buffers: shared hit=14104924 read=664536 dirtied=253 written=319
                     ->  Nested Loop Semi Join  (cost=2443.17..1977860.08 rows=1 width=34) (actual time=15.181..36911.130 rows=716720 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10514936 read=662715 dirtied=253 written=319
                           ->  Nested Loop  (cost=2442.61..1449092.44 rows=395669 width=38) (actual time=15.158..31979.807 rows=744009 loops=1)
                                 Buffers: shared hit=6904546 read=547460 dirtied=253 written=252
                                 ->  Hash Join  (cost=2442.17..1022517.53 rows=810210 width=34) (actual time=15.042..24424.435 rows=1538088 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=829085 read=462202 written=214
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..936016.60 rows=20255259 width=8) (actual time=0.048..16808.768 rows=37966199 loops=1)
                                             Buffers: shared hit=827228 read=462189 written=214
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=14.874..14.874 rows=4054 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 286kB
                                             Buffers: shared hit=1854 read=13
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.216..13.725 rows=4054 loops=1)
                                                   Buffers: shared hit=1854 read=13
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.009..0.019 rows=1 loops=1)
                                                         Filter: (n_name = 'CANADA'::bpchar)
                                                         Rows Removed by Filter: 24
                                                         Buffers: shared hit=1
                                                   ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=34) (actual time=1.200..12.876 rows=4054 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1853
                                                         Buffers: shared hit=1853 read=13
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.911..0.911 rows=4054 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.004 rows=0 loops=1538088)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6075461 read=85258 dirtied=253 written=38
                           ->  Index Scan using pk_lineitem on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.006..0.006 rows=1 loops=744009)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3610390 read=115255 written=67
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.003..0.003 rows=1 loops=716720)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3589988 read=1821
 Planning time: 10.289 ms
 Execution time: 39742.341 ms
(54 rows)

COMMIT;
COMMIT